Part C
Number of molecules in 8.437x10-2 mol C6H6

There are  

Explanation:

In this problem, we need to find the number of molecules in mol of .

The molar mass of is

No of moles = mass/molar mass

We can find mass from above formula.

Also,

No of moles = no of molecules/Avogadro number

Hence, there are  

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.

the answer is a for sure mark brainliest i had got this right on usatestprep